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HSA Investment Growth Calculator

See the full value of your HSA's triple tax advantage and project your balance to Medicare eligibility at 65.

Updated June 2026 · Editorial standards

Your HSA details

$
$

2024 limits — Individual: $4,150 | Family: $8,300

%
$
HSA at retirement
$444,290
Lifetime tax savings
$27,390
Annual tax savings
$913
Monthly retirement income· 4% rule
$1,481

Your HSA gives you a triple tax advantage worth $82,170. Contributions are pre-tax, growth is tax-free, and medical withdrawals are tax-free.Over 30 years your $4,150/year contributions grow to $444,290, saving $913/year in taxes.

HSA growth: contributions vs investment returns

At retirement — what built your balance

HSA contribution utilization

LowMaxed out
Maxed outMaxed out ($4,150/$4,150)

Contributing $4,150/year of the $4,150 individual limit. You are contributing the maximum allowed.

By the KalkWise Editorial Team Reviewed for accuracy Updated June 2026

What is the hsa calculator?

In short

An HSA (Health Savings Account) offers a triple tax advantage: contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. After age 65, you can withdraw for any expense (taxed like a traditional IRA). The 2024 contribution limit is $4,150 for individuals and $8,300 for family HDHP coverage.

This HSA calculator projects your balance to Medicare eligibility at 65, quantifies your annual and lifetime tax savings from the triple tax advantage, and shows how investing your HSA (rather than spending it) builds a powerful tax-free retirement reserve.

How to use this calculator

  1. 1Enter your current age and HSA balance.
  2. 2Select individual or family HDHP coverage and enter your annual contribution.
  3. 3Enter your tax bracket to calculate the deduction value.
  4. 4Set the threshold below which you keep cash (vs invest the rest).
  5. 5Review projected balance, tax savings, and triple-advantage value.

The formula

B=(B+C)×(1+r)n
tax savings=C×tax rate
Annual tax savings = contribution × tax bracket. Each year the invested portion (balance above threshold) earns the return rate. Triple advantage value approximates total benefit: contribution deduction + tax-free growth + tax-free medical withdrawals.
B
— HSA balance
r
— Annual investment return
τ
— Tax bracket (decimal)
C
— Annual contribution

Worked example

The scenario

Age 35, family plan, $8,300/year contribution, 22% bracket, 7% return, $2,000 cash threshold, retire at 65.

gives

The result

Projected balance: ~$920,000. Annual tax savings: $1,826. Lifetime tax savings: ~$54,800 in deductions alone.

Common use cases

  • Deciding whether to spend HSA funds now or invest them for retirement
  • Quantifying the tax benefit of maximizing HSA contributions
  • Planning the HSA as a 'stealth IRA' for healthcare costs in retirement
  • Comparing HSA vs FSA for tax-advantaged healthcare savings

Limitations & assumptions

  • You must be enrolled in a qualifying High-Deductible Health Plan (HDHP) to contribute to an HSA.
  • This calculator models the investment-focused HSA strategy — spending funds on current medical expenses resets the growth projection.
  • At 65, non-medical withdrawals are taxed as ordinary income (same as a traditional IRA); only medical withdrawals remain tax-free.

Frequently asked questions

1) Contributions are tax-deductible (or pre-tax if through payroll). 2) The balance grows tax-free when invested. 3) Withdrawals for qualified medical expenses are completely tax-free at any age. No other account offers all three benefits simultaneously.

Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.